Port gbproxy to NS2

Since NS2 has a different abstraction we mock up the prim send/recv
functions and don't test NS like the old tests did.

Related: SYS#4998
Change-Id: Iecfd0408a35a11638d254c1db3c1d477b1a11524
diff --git a/doc/examples/osmo-gbproxy/osmo-gbproxy-legacy.cfg b/doc/examples/osmo-gbproxy/osmo-gbproxy-legacy.cfg
index c471c38..c1dcfe7 100644
--- a/doc/examples/osmo-gbproxy/osmo-gbproxy-legacy.cfg
+++ b/doc/examples/osmo-gbproxy/osmo-gbproxy-legacy.cfg
@@ -25,7 +25,8 @@
  nse 666 nsvci 666
  nse 666 remote-role sgsn
 ! nse 666 encapsulation framerelay-gre
-! nse 666 remote-ip 172.16.1.70
+ nse 666 remote-ip 127.0.0.1
+ nse 666 remote-port 23001
 ! nse 666 fr-dlci 666
  timer tns-block 3
  timer tns-block-retries 3
@@ -35,6 +36,7 @@
  timer tns-alive 3
  timer tns-alive-retries 10
  encapsulation udp local-port 23000
+ encapsulation udp local-ip 127.0.0.1
 ! encapsulation framerelay-gre enabled 1
 gbproxy
  sgsn nsei 666